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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e60c291f04de26318939b1c8d8ec91338877aa79ca9239189d1a83db108c351' 
  AND token = 'ZvmuAupJs4UBvBowbfWScClxJ+xWhHcuX2SyNQWYA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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