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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f910e9c4b5c2b82c1c5cbd28a363cb9fee771bcfaabf7b929894821fe95754c' 
  AND token = 'BM6tT8jGrbZeiy+9tjiWE0cXP9iY3d0UAYsCUpHoPWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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