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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b10e9116c3aeec901b3076c0f5a4238bf157c045dac1046bcf407fd0ff5adec' 
  AND token = 'dpxR+DrmX9IKkoxiD02SkeBOiIR+42WkCFqtsq6jpLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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