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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6388a31c4aa0dd07251c146bcd6c812295c4113dffd711f0f26f9cdb2fcef194' 
  AND token = 'lvz389rv40s3Q6mi/RZkyzbbVamhVPZVQFO3Uc8KWG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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