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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eadb9352e075f1761ff4b635e9100500e34fc2a960ec42b2a8bf3820da0ddda9' 
  AND token = 'Ln+JyRUsJx2nyJ3plFUytlnsTclfDHJ/BioYAc9N0XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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