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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933f0ebff4e6abcf99ca2a3529fc9ecb468b900e38de48aecf45abe5a95a1c50' 
  AND token = '5VyB333xtEtPjAoInU5v2Uh+jkRWIVpcL0yPiMjP+h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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