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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3c67d3e0195d3a79ce7bc35e868ad9cb594907bc3ee992f2d9cc09f752d4010' 
  AND token = 'y+dC8MqnAGVUqbMW64SMKq1hxniPW823b9dCJuIAeNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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