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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c343b856e71d2333a4fd70ffae3efe6c848cd43fa384d99a6c9812c2e191e6e2' 
  AND token = 'M3fGNBfmAiTyF2oJrQzfnt1KhWk6//eUpmi1t2xVhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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