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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da0bc3ceefe5c4d2187a91a2db9dcb73f853ce11bab334ea486d6d68dc5be5a2' 
  AND token = 'SxzckZ7NUqZf1Hol73O8RAbYTtPUkVd7JgaFfVLQDeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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