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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5b1349bd1f90dc9c4901b82c141e81fa6f7f4c04bc9b4fd1f474ca8bfd4940' 
  AND token = 'MJ9MVtFV/ccmMDTNixWN+58OGyPExrIHteNEHR4CCcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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