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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edb22fec6f6a127df5b8ef9f1234431f7637b7b8fa29496a1d4e663466c9c317' 
  AND token = 'Ptm+cLWhRfTwtz82SrebWli+j2SPyLeRLkls7vk37kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}