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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3dbe9086bdc0bdff2dce97b34308327d2a52eb6959dc6c5357f754db88465d' 
  AND token = 'KCPE4sCs3qbMdyuivSwfz9ooviHxVqFEMxNsnAbgSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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