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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2fc746e2781ef0b52910125e6842fa267058caa0cfa593e9074db5158d889b9' 
  AND token = 'aPzezaSSufxvNkJav96hD/vAi891EnLI3f5WA5Dg+3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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