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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7556e69e0db6c59c6146be645bd67fbf3700c76097b5a0008eab674de7f894b' 
  AND token = 'jwHHusMaa2eWxS8bpZPAk3aYun8k+V6GRJ+cSI2ZS7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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