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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0455ec91128d8ad7890de3c1dba68e0d3ad68a9ddc387020ca97f9e0c8792724' 
  AND token = 'k/f5HmphSq9oJPdqzwTlt4iEntiVOIH8el4Bgew7MZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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