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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f8035980b35ef5fbd7165e541c56d21ab621106677817a7aa10b10c1149df19' 
  AND token = 'AiS5bVQJC605bU9+qPCEZsGYB7Wh/t763uZn46cCF6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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