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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0751c86b13700377c805e6c05f74dd5446f069fe1dad80511e6e53daa7ac770d' 
  AND token = '5kKZjSoudzubUyz8JfZVuxtL/759m9T7moFGX3QaopE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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