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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd9aa437bd69819f85cc1b73e60e918abe62ed5db6305ad009d4ef28c8a0c5b9' 
  AND token = 'Uak/haNSAAko+Uf/4/F8vgeo+nYlRyNBCN8SpbknojA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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