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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b25aede86d91ded6b72d3db86d489f32fdc7f0e8794edfbbe5f64539080701b' 
  AND token = 'k9xH77sI2UJrkzoaBTpeqwqO9HiBDb4lv+AIF+IS2Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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