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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06e996196c348d44a2b4626f6d71f2701c29407e2d7419c4d2a81476ac34a017' 
  AND token = '5EGurQhpurKbhD68UXxfcK18no1PZVF3jn/VD1u4c3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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