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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '667df314d7e4266d21b3706ba1d72b4a0b73bbb1a8ea2e24af106a96820ee4e7' 
  AND token = 'ELiBy4Y4szOHkErJyVqOrjpIX10g2/3EFt+aeFojMqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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